si_0604	Xanthine_Metabolism_in_Bacteria	Hypoxanthine/guanine permease PbuG
si_0604	Xanthine_Metabolism_in_Bacteria	Nucleoside permease NupC
si_0604	Xanthine_Metabolism_in_Bacteria	Xanthine permease
si_0604	Xanthine_Metabolism_in_Bacteria	Xanthine phosphoribosyltransferase (EC 2.4.2.22)